Setting the default branch
The default branch is considered the base branch in your repository, against which all pull requests and code commits are automatically made, unless you specify a different branch.
Your default branch is named master. If you have admin rights over a repository on your GitHub Enterprise Server instance, you can change the default branch on the repository.
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On GitHub Enterprise, navigate to the main page of the repository.
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Under your repository name, click Settings.
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In the left menu, click Branches.
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In the default branch sidebar, choose the new default branch.
You can only switch between branches that already exist on your GitHub Enterprise Server instance. To create a new branch through the UI, see "Creating and deleting branches within your repository".
Warning: This affects your trunk branch contents on the Git-Subversion bridge and the HEAD you'd see when you git ls-remote this repository's upstream URL.